dude, it's damn near impossible to mess up while pulling of tint. It's like peeling off a sticker. Trust me, I used to tint windows. If you seriously don't trust professionals and would rather do it yourself, here's what you do.
1. Spray some ammonia all over the rear windshield. (Optional)
2. Take a razor blade, and nick an edge (where there are no defogger lines).
3. Just peel...keep your hand close to the window while pulling. this will reduce the amount of adhesive left on the windshield.
4. Once you get all of it off, fill up a spray bottle with Take a soft scrubber sponge and gently rub it against the windshield until you get the left over adhesive off.
Florida legal is 35%, but almost everyone, myself included, has 20% or darker. It's so damn hot here that they do not enforce the tint laws.
Legal limit in FL is actually 27%. So the highest common denomination would be 30%. Just to let you know.[/quote]